PSP - Ogg and MediaEngine Status

[SX]

So I've finally figured out how the media engine works thanks to the ps2dev.org forum.  I tried just some simple stuff to get the grasp of how it works and so far things are looking good.  

My next step is to take what we have now as far as decoding pcm audio and have that run on the MediaEngine.  If all goes well, then I will try to port the stb_vorbis decoder over to the MediaEngine also.

The current version of Ogg/Vorbis decoder provided by the people at ps2dev.org uses the main Processor, hopefully if successful my MediaEngine/stb_vorbis decoder will fix the audio delay but at the same time boost fps, since all audio tasks will be running on MediaEngine leaving more main CPU cycles available to the engine/video system.

[Damon Caskey]

That would be a boon SX!

I wonder, are we still relying on the main processor for the DC port?

DC

[Roel]

Be advised that stb_vorbis has a few bugs, most notably memory leaks. I informed the author a while ago, but last time I checked they were still there.

[msmalik681]

great work sx 

[bWWd]

great news

[SX]

So here are my findings thus far....

The sound mixer and ADPCM are extremely efficient!  I had purposely disabled audio updates to simulate what kind of boost to expect and there was not even a 1 fps difference.  So converting the audio system to use the MediaEngine would not buy us anything.  That being said, I will start looking at the stb_vorbis decoder, since that is where the delay exists.

[Plombo]

So here are my findings thus far....

The sound mixer and ADPCM are extremely efficient!  I had purposely disabled audio updates to simulate what kind of boost to expect and there was not even a 1 fps difference.

Well, there might have been a 1 fps difference...OpenBOR's method of calculating framerates can't detect differences of 1 fps.  It just divides 1000 by the frame time to the nearest millisecond.  So it can only express 1000 fps, 500, 250, 200, 166, 142, 125, 111, 100, 90, 83, 76, 71, 66, 62...et cetera.